6-5
Problem Probable Causes Corrective Action
Filter pump runs,
but oil return is very
slow and bubbling
oil occurs.
B. Attempting to filter with oil or
shortening that is not hot enough.
B. In order to properly filter, the
oil or shortening should be at
or near 350ºF (177°C). At
temperatures lower than this,
the oil becomes too thick to
pass through the filter medium
easily, resulting in much slower
oil return and eventual
overheating of the filter pump
motor. Make sure oil is at or
near frying temperature before
draining oil into filter pan.
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